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/*
* lib/krb5/ccache/stdio/scc_maybe.c
*
* Copyright 1990,1991 by the Massachusetts Institute of Technology.
* All Rights Reserved.
*
* Copyright 1995 by Cygnus Support.
*
* Export of this software from the United States of America may
* require a specific license from the United States Government.
* It is the responsibility of any person or organization contemplating
* export to obtain such a license before exporting.
*
* WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
* distribute this software and its documentation for any purpose and
* without fee is hereby granted, provided that the above copyright
* notice appear in all copies and that both that copyright notice and
* this permission notice appear in supporting documentation, and that
* the name of M.I.T. not be used in advertising or publicity pertaining
* to distribution of the software without specific, written prior
* permission. M.I.T. makes no representations about the suitability of
* this software for any purpose. It is provided "as is" without express
* or implied warranty.
*
*
* This file contains the source code for conditional open/close calls.
*/
#include "scc.h"
#include "k5-int.h"
int krb5_scc_default_format = KRB5_SCC_DEFAULT_FVNO;
krb5_error_code
krb5_scc_close_file (context, id)
krb5_context context;
krb5_ccache id;
{
krb5_scc_data *data;
int ret;
krb5_error_code retval;
data = (krb5_scc_data *) id->data;
if (data->file == (FILE *) NULL)
return KRB5_FCC_INTERNAL;
#ifdef ultrix
errno = 0;
#endif
ret = fflush (data->file);
#ifdef ultrix
/* their LIBC refuses to allow an fflush() of a read-only buffer!
We patch around it by only calling it an error if errno is set by a
(failed) syscall */
if (ret == EOF && !errno) ret = 0;
#endif
memset (data->stdio_buffer, 0, sizeof (data->stdio_buffer));
if (ret == EOF) {
int errsave = errno;
(void) krb5_unlock_file(context, fileno(data->file));
(void) fclose (data->file);
data->file = 0;
return krb5_scc_interpret (context, errsave);
}
retval = krb5_unlock_file(context, fileno(data->file));
ret = fclose (data->file);
data->file = 0;
if (retval)
return retval;
else
return ret ? krb5_scc_interpret (context, errno) : 0;
}
krb5_error_code
krb5_scc_open_file (context, id, mode)
krb5_context context;
krb5_ccache id;
int mode;
{
char fvno_bytes[2]; /* In nework standard byte order, big endian */
krb5_scc_data *data;
FILE *f;
char *open_flag;
krb5_error_code retval;
data = (krb5_scc_data *) id->data;
if (data->file) {
/* Don't know what state it's in; shut down and start anew. */
(void) krb5_unlock_file(context, fileno(data->file));
(void) fclose (data->file);
data->file = 0;
}
#ifdef ANSI_STDIO
switch(mode) {
case SCC_OPEN_AND_ERASE:
unlink(data->filename);
/* XXX should do an exclusive open here, but no way to do */
/* this under stdio */
open_flag = "wb+";
break;
case SCC_OPEN_RDWR:
open_flag = "rb+";
break;
case SCC_OPEN_RDONLY:
default:
open_flag = "rb";
break;
}
#else
switch(mode) {
case SCC_OPEN_AND_ERASE:
unlink(data->filename);
/* XXX should do an exclusive open here, but no way to do */
/* this under stdio */
open_flag = "w+";
break;
case SCC_OPEN_RDWR:
open_flag = "r+";
break;
case SCC_OPEN_RDONLY:
default:
open_flag = "r";
break;
}
#endif
f = fopen (data->filename, open_flag);
if (!f)
return krb5_scc_interpret (context, errno);
#ifdef HAS_SETVBUF
setvbuf(f, data->stdio_buffer, _IOFBF, sizeof (data->stdio_buffer));
#else
setbuf (f, data->stdio_buffer);
#endif
switch (mode) {
case SCC_OPEN_RDONLY:
if ((retval = krb5_lock_file(context,fileno(f),KRB5_LOCKMODE_SHARED))){
(void) fclose(f);
return retval;
}
break;
case SCC_OPEN_RDWR:
case SCC_OPEN_AND_ERASE:
if ((retval = krb5_lock_file(context, fileno(f),
KRB5_LOCKMODE_EXCLUSIVE))) {
(void) fclose(f);
return retval;
}
break;
}
if (mode == SCC_OPEN_AND_ERASE) {
/* write the version number */
int errsave;
fvno_bytes[0] = krb5_scc_default_format >> 8;
fvno_bytes[1] = krb5_scc_default_format & 0xFF;
data->version = krb5_scc_default_format;
if (!fwrite((char *)fvno_bytes, sizeof(fvno_bytes), 1, f)) {
errsave = errno;
(void) krb5_unlock_file(context, fileno(f));
(void) fclose(f);
return krb5_scc_interpret(context, errsave);
}
} else {
/* verify a valid version number is there */
if (!fread((char *)fvno_bytes, sizeof(fvno_bytes), 1, f)) {
(void) krb5_unlock_file(context, fileno(f));
(void) fclose(f);
return KRB5_CC_FORMAT;
}
data->version = (fvno_bytes[0] << 8) + fvno_bytes[1];
if ((data->version != KRB5_SCC_FVNO_1) &&
(data->version != KRB5_SCC_FVNO_2) &&
(data->version != KRB5_SCC_FVNO_3) &&
(data->version != KRB5_SCC_FVNO_4)) {
(void) krb5_unlock_file(context, fileno(f));
(void) fclose(f);
return KRB5_CCACHE_BADVNO;
}
if (data->version == KRB5_SCC_FVNO_4) {
char buf[1024];
int len;
if (!fread((char *)fvno_bytes, sizeof(fvno_bytes), 1, f)) {
(void) krb5_unlock_file(context, fileno(f));
(void) fclose(f);
return KRB5_CC_FORMAT;
}
if ((len = (fvno_bytes[0] << 8) + fvno_bytes[1]) != 0) {
if (!fread(buf, len, 1, f)) {
(void) krb5_unlock_file(context, fileno(f));
(void) fclose(f);
return KRB5_CC_FORMAT;
}
}
}
}
data->file = f;
return 0;
}
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